Anode active material for lithium secondary battery, method of manufacturing the same, and lithium secondary battery including the anode active material

a lithium secondary battery and anode active material technology, applied in the manufacturing process of electrodes, silicon oxides, cell components, etc., can solve the problems of high irreversibility of charging and discharging, and high capacity of amorphous carbon, etc., to achieve excellent capacity retention rate and high charge/discharge capacity

Inactive Publication Date: 2013-05-23
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution improves initial efficiency and extends the battery's lifetime by reducing volume changes and maintaining high charge / discharge capacity and capacity retention rates compared to uncoated materials.

Problems solved by technology

However, when the lithium metal is used in a lithium battery, dendrites may be formed, and thus, electrical shorts may be generated and the battery may explode.
Amorphous carbon has high capacity but also may have a high irreversibility in charging and discharging.
However, since the theoretical limit capacity of graphite or a carbon based active material is not greater than 380 mAh / g, an anode active material formed of such material may not be desirable for high capacity lithium batteries.

Method used

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  • Anode active material for lithium secondary battery, method of manufacturing the same, and lithium secondary battery including the anode active material
  • Anode active material for lithium secondary battery, method of manufacturing the same, and lithium secondary battery including the anode active material

Examples

Experimental program
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Effect test

example 1

Coating a LixAlyO Precursor onto Si Particles

[0063]6.6 g of a methylene chloride solution of 1.0 M Aluminum tri-sec-butoxide (Al[OCH(CH3)C2H5]3, Aldrich), 0.12 g of LiOH, and 5 g of ethanol were mixed in a 50 ml vial, and the mixture are stirred for 24 hours to manufacture an oxide precursor including lithium. 0.6 g of Si particles having a diameter of about 300 nm and 6 g of ethanol are mixed in a 50 ml vial, and then, the Si particles are scattered using ultrasonic waves for 1 hour. 2.349 g of the oxide precursor including lithium are added to the Si and ethanol mixture, and the added resultant is stirred in a bath at 60° C. and dried. The dried resultant is heat treated at 850° C. under a nitrogen atmosphere to complete the manufacture of an anode active material.

example 2

Coating a LixSiyO Precursor onto Si Particles

[0064]2.08 g of silicon tetraethoxide (Si(OC2H5)4, Aldrich) and 0.234 g of LiOH are mixed in a 50 ml vial and are stirred for 24 hours to manufacture an oxide precursor including lithium. 0.45 g of Si particles having a diameter of about 300 nm and 6 g of ethanol are mixed in a 50 ml vial, and the Si particles are scattered using ultrasonic waves for 1 hour. 0.155 g of the oxide precursor including lithium is added to the Si and ethanol mixture and the added resultant is stirred in a bath at 60° C. and dried. The dried resultant is heat treated at 850° C. under a nitrogen atmosphere to complete the manufacture of an anode active material.

example 3

Coating a LixTiyO Precursor onto Si Particles

[0065]12.75 g of titanium butoxide (Ti(OC4H9)4, Aldrich) and 0.756 g of LiOH are mixed in a 50 ml vial and are stirred for 24 hours to manufacture an oxide precursor including lithium. 0.5 g of Si particles having a diameter of about 300 nm and 6 g of ethanol are mixed in a 50 ml vial and the Si particles are scattered using ultrasonic waves for 1 hour. 0.2184 g of the oxide precursor including lithium is added to the Si and ethanol mixture and the added resultant is stirred in a bath at 60° C. and dried. The dried resultant is heat treated at 850° C. under a nitrogen atmosphere to complete the manufacture of an anode active material.

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Abstract

An anode active material includes a material alloyable with lithium coated with an oxide including lithium or coated with a complex of an oxide including lithium and an electrically conductive material. An anode of a lithium secondary battery includes the anode active material.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is a continuation application based on pending application Ser. No. 12 / 545,186, filed Aug. 21, 2009, the entire contents of which is hereby incorporated by reference.[0002]This application claims the benefit of Korean Patent Application No. 10-2008-0124658, filed on Dec. 9, 2008, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.BACKGROUND[0003]1. Field[0004]One or more embodiments relate to an anode active material for a lithium secondary battery, a method of manufacturing the anode active material for a lithium secondary battery, and a lithium secondary battery including the anode active material.[0005]2. Description of the Related Art[0006]In general, a lithium metal may be used as an anode active material of a lithium battery. However, when the lithium metal is used in a lithium battery, dendrites may be formed, and thus, electrical shorts may be generated and ...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H01M4/131H01M4/134C01B33/12C01F7/00C01G23/00H01M4/36H01M4/38H01M4/48H01M4/485
CPCH01M4/366H01M4/38H01M4/134Y02E60/122H01M4/131H01M4/485Y02E60/10H01M4/04H01M4/48
InventorMAH, SANG-KOOKKIM, HAN-SUKANG, YOON-SOK
OwnerSAMSUNG SDI CO LTD